<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=s, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var arr = [10, 20, 4]
        var flag = arr.some(function (value) {
            return value >= 20
        })
        console.log(flag);
    </script>
</body>

</html>